3Pcs/Set 6.35mm 1/4 Inch Shank T-Track,T-Slot Keyhole Cutting Cutter Groove Milling Cutter Wood Milling Cutter for 3/8 Inch 1/2 Inc 1. 2. Alloy blade with welding, stable quality, high efficiency.3. Turn carpenters to drill holes without going through the material when clean and precise bottom into the hole4. Suitable for handheld electric drill, stand-up motor driven drill and band-type mobile magnetic drill.5. Used for slotting a wide range of materials, including density board, solid wood, MDF, particle board, plywood, etcMaterial: alloySize: 6.35*47mmColor: SilverPackage Content:3*t-slot keyhole cutterOnly the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement error is +/- 1-3cm.