ZEV Technologies Pro Plus Mag-well has an aluminum one piece design with a matte black, smooth anodized finish. The mag-well is slightly flared at the base which makes it ideal for quickly inserting the magazine in the pistol during reloads. It comes with one magwell body, mounting screw, and allen wrench. Compatible w/Glock 17/17C/17L/22/22C/34/35/37 Gen 1-4, 24/24C Gen1-3 standard and compact.*Note does not work with 10rd magazine and Gen4 backstraps may need to be modified if used.