High PrecisionThe T-slot knife features durable carbon steel handle, well-executed with high hardness, precise positioning, high precision, smooth cutting and impact resistance. Heat treated for clean cutting, can be resharpened. Professional Cutting BladeThe blades are made of quality carbide alloy, sharp and durable. The heat-resistant Teflon coating to prevent the build-up of sawdust, resin and pitch, and the arc curve design is good for chip disposal. Handle Carbon SteelThe handle of the T-slot cutter is made of sturdy carbon steel, with anti-kickback design, durable and solid, which provides you with maximum strength and durability. Widely UsedThese 2 T-slot router bits are used for hole punching wood, installing spherical door spike, plastic products, wood, plywood, etc. Package Includes1 x T-slot Cutter for 1/2" Hex Bolt and 1 x T-slot Cutter for 3/8" Hex Bolt. Set of 2 T-slot for 3/8" and 1/2" hex screws - Professional woodworking tools: perfect for precision cutting grooves and grooves for projects shelves and cabinets and also for other simple straight cut applications. - Hardened steel bodies with anti-kickback design ensure secure installation and cut all materials like plywood, hardwood and softwood. Specifications: Material: Carbide Alloy Shank diameter: 8mm Cutting edge diameter: 12.7mm (1/2"), 9.52mm (3/8") Weight: 18g each Package includes: 1 x T-groove cutter 1/2 1 x T-groove cutter 3 /8 YOTINO Set of 2 T-Slot Cutters for 3/8" and 1/2" Hex Screw The size in the difference 1-3cm in size is within the normal range due to manual measurement. Color may have a little difference due to lights, screens.