Pieces Drill Depth Stop, 3-16 mm, Depth Stop Collars Ring Positioner with Hex Key (8).

High-Quality Materials: Drill Bit Depth Stop Set. Made of high-quality carbon steel, the surface is blackened, rust and corrosion resistant, high hardness, and difficult to wear and deform. Multiple Sizes: The Drill Bit Depth Stop Set consists of 8 pieces: 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mm, and 16mm, along with small wrenches. Different sizes can meet various needs. Easy to Use: Simply choose the appropriate size drill bit and stop collar, slide the collar onto the drill bit, and set the required depth with a ruler or depth gauge (not included). Then, tighten the collar screw with the included hex key. Improved Design: The split ring design allows the stop collar to lock securely along the diameter of your drill bit. Lower screw collars can cause misalignment or damage to the drill bit, but our improved split ring units have a split design with one face parallel to the drill bit's axis, and they won't move or ride up on the bit after tightening. Use: Drill depth stops are used to precisely control the drilling depth when drilling holes in wood to prevent material waste.