GripEdge | Ultimate RPT Star Driver Bundle | Buy MST45S & Get STP13S Free

Buy 1, Get 1 Free: The Ultimate RPT™ Star Driver Bundle

Star recesses resist cam-out well when tool and fastener are in tolerance. But as a socket wears or corrosion narrows the recess, the contact patch shifts to the lobe tips: the tool still seats, but torque now deforms the recess instead of turning the fastener. This bundle covers both prevention and recovery across one drive family. The MST45S 45-Pc Master RPT™ Star Driver Set handles standard Torx, tamper-proof, and external E-Star, and the STP13S 13-Pc RPT™ Star Plus Driver Set ships free, adding the Star Plus profile. Together they cover the full spectrum of star-pattern fasteners in serviceable and compromised condition.

Both sets share the same patented RPT™ engagement profile, so torque-transfer behavior is consistent across the entire range, from a T6 micro-driver to a seized E24. No socket in either set is a reduced-specification piece.

What's in the bundle

• MST45S: 45-Pc Master RPT™ Star Driver Set — Standard Torx T6 through T100, tamper-proof T8H through T55H, and external E-Star E4 through E24. A complete star-drive foundation spanning internal, security, and external profiles in a single case.
• STP13S: 13-Pc RPT™ Star Plus Driver Set (FREE) — Sizes IP6 through IP60. The Star Plus profile, a six-lobe geometry with squared-off flanks that expand the contact area for higher torque capacity, used extensively in modern automotive and equipment assembly.

The engineering behind the grip

• Reprofiled tooth geometry that loads inward. A standard star tool concentrates contact stress at the lobe corners and drives material radially outward, progressively enlarging the recess and initiating cam-out under load. The RPT™ profile relocates the contact point along the lobe 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.
• Single-tool prevention and extraction. Because the RPT™ profile maintains engagement on both nominal and deformed recesses, the same socket that prevents rounding on installation will also break loose a fastener whose recess has already degraded, eliminating the need for a dedicated extraction set.
• Bi-directional load capacity. The profile transfers torque in both rotational directions for removal and installation. Where a replacement fastener is unavailable, a compromised fastener can be re-driven and torqued to hold temporarily.
• Full profile coverage. The two sets together span internal Torx, tamper-proof, external E-Star, and Star Plus patterns across a working range of T6 to T100 and E4 to E24, covering the internal, security, external, and high-torque star geometries encountered in field service.
• Materials and marking. Star sockets are precision-machined from S2 tool steel for hardness and fatigue resistance under repeated loading; the master set's E-Star sockets are formed from Cr-Mo steel for impact durability. All sockets carry corrosion-resistant plating and oversized, roll-stamped, ink-filled size markings, and ship in a premium case with a removable foam insert.

Two sets, one free, and a single engagement principle across every star geometry from a T6 micro-fastener to a seized E24. Don't strip it. GRIP IT.

For the tooth-geometry analysis and supporting torque data, see our RPT™ Technology page.