Features The grinding head is made of pink funsed alumina PA with high durability Complete range, easy to process, the shank diameter is 3mm which is simple to replace High working efficiency, perfect grinding effect and long using life Including 100pcs grinding heads, easy and simple to replace Suitable for DIY polishing jade, wood, metal, etc. Specification:Item Type: Grinding Head Product Use: Used for DIY polishing jade, wood, metal, etc. Material: Pink Funsed Alumina PA Grit Size: 80 grit Shank Diameter: Approx. 3mm / 0.1in Length: Approx. 40mm / 1.6in Specification Size(shank diameter x grinding head diameter): Cone Shape: Approx. 3 x 4mm / 0.1 x 0.2in 3 x 5mm / 0.1 x 0.2in 3 x 6mm / 0.1 x 0.2in 3 x 8mm / 0.1 x 0.3in 3 x 10mm / 0.1 x 0.4in Cylindrical Shape: 3 x 4mm / 0.1 x 0.2in 3 x 5mm / 0.1 x 0.2in 3 x 6mm / 0.1 x 0.2in 3 x 8mm / 0.1 x 0.3in 3 x 10mm / 0.1 x 0.4in Package List:10 x Cone Grinding Head: 3x4mm 10 x Cone Polishing Head: 3x5mm 10 x Cone Grinding Head: 3x6mm 10 x Cone Grinding Head: 3x8mm 10 x Cone Grinding Head: 3x10mm 10 x Cylindrical Polishing Head: 3x4mm 10 x Cylindrical Polishing Head: 3x5mm 10 x Cylindrical Grinding Head: 3x6mm 10 x Cylindrical Polishing Head: 3x8mm 10 x Cylindrical Grinding Head: 3x10mm  Package List 10 x Cone Grinding Head: 3x4mm 10 x Cone Polishing Head: 3x5mm 10 x Cone Grinding Head: 3x6mm 10 x Cone Grinding Head: 3x8mm 10 x Cone Grinding Head: 3x10mm 10 x Cylindrical Polishing Head: 3x4mm 10 x Cylindrical Polishing Head: 3x5mm 10 x Cylindrical Grinding Head: 3x6mm 10 x Cylindrical Polishing Head: 3x8mm 10 x Cylindrical Grinding Head: 3x10mm