2 Pcs Drill Depth Stop Collar Set, Adjustable Aluminum Drill Bit Stopper with Protective Nylon Inner Ring, Fits 5/64"-7/16" Bits, Precision Depth Controller for Woodworking & Plastics

["PROTECTIVE NYLON INNER RING: Unlike all-metal stops that directly grind against expensive bits, our collar features a built-in nylon locking ring. It acts as a cushion to securely hug the bit, effectively preventing metal-to-metal scratches and protecting the integrity of your drill bit surface.","IDEAL FOR SHALLOW TO MEDIUM HOLES: Designed for precision and stability. Note: The collar's robust height ensures straight rotation but will occupy a portion of the bit's length. Therefore, it is highly recommended for shallow to medium-depth drilling rather than deep holes.","OPTIMIZED FOR WOOD & PLASTIC (NOT FOR METAL): Engineered specifically for woodworking, acrylics, and plastics. ⚠️ IMPORTANT: Do not use on metal. Drilling metal creates extreme torque that easily causes the nylon ring to slip or sustain irreversible wear and tear.","WIDE COMPATIBILITY & PRO TIP: Includes two collars fitting 5/64\"-3/16\" and 15/64\"-7/16\". PRO TIP: When using extreme small bits (like 5/64\") at the limit of the range, wrap a tiny piece of painter's tape around the bit shank before clamping. This significantly enhances the friction for a more reliable grip.","LIGHTWEIGHT ALUMINUM BODY: The outer shell is crafted from lightweight aluminum alloy, preventing top-heavy imbalance on your drill. Easy to lock and unlock with a simple twist, it offers a practical balance of bit protection and depth control."]