Master Mechanic, 16 Gauge, Pneumatic Medium Crown Stapler, Easily Adjusts Driving Depth Without Any Tools, Consists Of Lightweight Aluminum Rail, Cylinder & Housing, Tool Free Depth Adjustment System Makes It Quick & Easy To Adjust Driving Depth For The Project At Hand, Lightweight Aluminum Housing & Construction Improves Comfort & Control During Operation, Quick Release Nose Makes It Easy To Clear Jams Uses 16 Gauge 7/16" Medium Crown Staples Ranging From 3/4" To 2".