The 10-8 pad is slightly thicker than the factory pad, and features angled sides and front to allow for easy stripping of stuck magazines. The pads also feature a grooved front and scalloped sides for positive grip during manipulations. The bottom of the pad features our usual dimples for marking your magazines. Fits Glock magazines for 9mm, .40 S&W, .357 Sig, .45 GAP. NOT compatible with early production non metal lined (Gen1) Glock magazines, but do fit all subsequent generations to include those for the Gen5. NOT COMPATIBLE with Glock 26/27 where the magazine base pad has to fit in a recess in the frame. **Our pads DO fit in the Gen 5, 17/19M, and 19X. The Glock 19X frame has a lip at the front and our pads will just barely clear. Compatible with common magazine well setups, including the Sentinel Design and Raven Concealment Systems Freya mag well, Magpul Gen4 mag well, and Zev Pro. Is known to be INCOMPATIBLE with the Zev Universal Pro magwell.