ZEV Technologies Professional Mag-well is a great addition for any shooter looking for an edge with out the bulk flared competition style mag-well. It has an aluminum one piece design with a matte black, smooth anodized finish. The mag-well also has a 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. This model is compatible with Glock 17/17L/22/22C/24/24C/31/31C/34/35/37 Gen 1-3 standard. It does not work with 10-round magazines.