Item Type: Chamfering device Material: HSS Tool Holder: Approx. 6mm / 0.2in 8mm / 0.3in 10mm / 0.4in 12mm / 0.5in Head Diameter: Approx. 10mm / 0.4in 14mm / 0.6in 21mm / 0.8in 28mm / 1.1in Color(optional): Gold, silver Golden Surface Treatment: Ti plating Cutting Hole Size: Approx. 2-5mm / 0.1~0.2in, 5-10mm / 0.2~0.4in, 10-15mm / 0.4~0.6in, 15-20mm / 0.6~0.8in Package List 4 x Chamfering Device When water or cold oil is needed for edge processing, be careful of the drill bit burning. 1The product is made of HSS4241 high-speed steel , durable and not easy to rot. 290 Degrees angle can achieve incisive and precise counterbore, used for chamfering or taper hole of workpiece. 3The product is perfect fo cutting metal, wood, plastic and thin iron plates. 4The chamfering device is made of high-quality materials, which is sturdy and has long service life. 5With Ti-plated surface treatment, this product can be more beautiful with surface hardness increasement.