Solid hardened steel bodies with anti kickback design. Build-up & heat resistant PTFE coating. Totally enclosed & lubricated. Industrial grade Mini-grain alloy blade. Simple construction, easy to operate. Perfect choice of professionals and hobbyists. Using for hand-making a drawer or other woodworking. Suitable for woods, MDF, particle board, plywood compact panel; Avoid cutting ferrous metal and non wood materials, such as: steel, iron, sand, etc. name: slot router bit set Material: alloy , steel Colors: silver and yellow size: Handle Diameter: 1/2 inch (12.7 MM) Tooth width: 1/4 inch(6.35 MM) Depth of tooth: 1/4 inch(6.35 MM) Tongue Router Bit Size: 75 x 40mm / 2.95 x 1.57 inch(L x Dia) Slot Router Bit Size: 72 x 40mm / 2.83 x 1.57 inch (L x Dia) Weight: 238 grams For circuit board size: 13-19mm Package Included: 2 x Tongue router bit 2 x Groove router bit Safety Code: 1. The razor blade is permanently encapsulated in the blade or housing where the blade is exposed, and the blade length is less than 2 mm. 2. Blade products do not apply to people under 18 years of age. 3. This item is for industrial cutting / engraving only, not dangerous goods.