GripEdge | Ultimate Triple Square Bundle

Buy 1, Get 1 Free: The Complete RPT™ Triple Square Bundle

Triple square fasteners are a high-torque drive by design, which is exactly why they fail hard. The twelve-point contact that lets a 12-spline bolt carry clamp loads on a cylinder head or a driveline flange also means a worn or over-torqued recess rounds out fast, and once it does, a standard socket has nothing square to bear against. This bundle covers both ends of that problem: the controlled hand-drive work where precision matters, and the high-impact removal where torque matters. The MTS39S 39-Pc Master RPT™ Triple Square Socket Set is the complete hand-drive foundation, and the ITS12S 12-Pc RPT™ Standard Impact Triple Square Driver Set ships free, adding impact-rated capability for the fasteners that will not move by hand.

Both sets share the same patented RPT™ engagement profile, so torque-transfer behavior is consistent whether you are seating an M4 by hand or driving a seized M18 with an impact gun. Nothing in either set is a reduced-specification piece.

What's in the bundle

• MTS39S: 39-Pc Master RPT™ Triple Square Socket Set. Standard, low-profile, extra-long 6", and tamper-proof bit sockets across 1/4", 3/8", and 1/2" drive. Standard sizes M4-M18, plus tamper-proof MT14, MT16, and MT18. The complete hand-drive foundation covering standard fastening, low-clearance access, deep-reach applications, and security hardware in one case.
• ITS12S: 12-Pc RPT™ Standard Impact Triple Square Driver Set (FREE). Sizes M4-M18 across 1/4", 3/8", and 1/2" drive. Impact-rated drivers machined from Chromoly steel to withstand the repeated hammer blows of an impact wrench on fasteners that are corroded, seized, or torqued beyond hand-tool range.

The engineering behind the grip

• Reprofiled tooth geometry that loads inward. A standard triple square tool concentrates contact stress at the spline corners and drives material radially outward, enlarging the recess until the drive rounds. The RPT™ profile relocates the contact point along the spline flank and directs force inward, forming a mechanical lock that increases engagement as torque rises. Load transfers into the fastener body rather than shearing the recess walls, yielding up to 50% more torque capacity on undamaged fasteners and up to 400% more on compromised ones.
• Hand precision and impact power in one system. The MTS39S covers controlled, measured work where feel and clearance matter: low-profile sockets for tight spaces, extra-long sockets for recessed bolts, tamper-proof sockets for security hardware. The ITS12S takes over where hand tools stall, delivering impact-rated removal on fasteners that are seized or torqued past what a hand drive can break loose. Together they span the full service sequence from installation to extraction.
• Bi-directional engagement. The profile transfers torque in both rotational directions for removal and installation, and grips new and compromised fasteners alike, so a rounded triple square recess can be driven out without resorting to a drill.
• Full-coverage sizing. Between the two sets you get the complete M4 through M18 triple square range plus MT14-MT18 tamper-proof sizes, spanning the cylinder-head bolts, drivetrain assemblies, suspension components, and interior hardware common to Audi, Volkswagen, Porsche, and other European platforms, as well as European industrial and agricultural equipment.
• Materials and marking. The MTS39S hand-drive sockets are precision-machined from S2 tool steel for torsional strength; the ITS12S impact drivers are formed from Chromoly steel for impact durability. Both carry corrosion-resistant finishes and clear size markings, and the master set ships in a custom-molded case with a removable textured EVA foam inlay and printed size labels.