Specifications: Drilling dia.: 40mm; shank size: 10mm; drilling depth: 60mm; total length: 90mm. Round shank, cemented carbide cutter and solid hardened steel body. Applications: Can be used for drilling holes on wood and plastic products, furniture, door hinge. Used on cutting wood, plywood, solid wood boards, MDF, plastics, fiberglass etc.. Forstner drill bit is for industrial purpose Features: Tungsten carbide cutting tip with special heat treatment for sharp cutting edge, high hardness, non-burrs and durable use. Arc curve design head for easy chip-removal, more efficient perforation How To Use: Suitable for bench drill, vertical drilling machine, CNC carving machine. Processing hardwood or other hard materials should be injected with water to improve the quality and accuracy of drilling, and extend the life of the hole opener. Tips: Maximum speed: 1200rpm. Used on desktop (fixed) equipment, and can NOT be used on handheld power tools (such as hand drill or electric drill). Can not drill metal and non-ferrous metal. To avoid causing damage, be sure no nails or other metal objects in wood before drilling. The cutting edge and tip of the opener should be sharpened in time. 1. 40mm Carbide Forstner Bit drill clean holes in soft and hard wood. 2. Two spurs and centering point to give the perfect solution to repeated, clean and accurate hole cutting time after time. 3. The sharp center spur accurately locates the center of your hole. 4. Use to drill precise flat bottom holes with no chipping in any thickness of soft wood. 5. For drilling holes in any direction and making arched openings. For drilling partially overlapped flat bottom holes for easy mortising. 6. Forstner Bit for industrial purpose is characterized with high hardness and long life, and resulting in nice finishing on woody pieces after cutting. 7. Should be use with bench drill, vertical drilling machine, CNC carving machine. Tips: Maximum speed: 1200rpm. Used on desktop (fixed) equipment, and can NOT be used on handheld power tools (such as hand drill or electric drill). Can not drill metal and non-ferrous metal. To avoid causing damage, be sure no nails or other metal objects in wood before drilling. The cutting edge and tip of the opener should be sharpened in time. Specification: Product Name: Forstner Bit Material: Carbide, Carbon Steel Cutting Diameter: 40mm / 1.57inch Shank Diameter: 10mm / 0.4 inch Shank Length: 30mm / 1.2 inch Total Length: 90mm / 3.54 inch Package Content: 1 x Forstner Bit Weight: 180g; Main Color: Black, Silver Tone Please Note: 1.When drilling holes, forstner drill bit is made only in the clockwise direction, not reversible, and the speeds from low to high is a gradual process. 2.Please grind the tool nose and tips to avoid ageing and damage when breaking; or it will cause a steep decrease in accuracy and quality for drilling holes after tips break.