Model: diamond grinding rod Quality: high Weight: 112 g / 4 oz Material: diamond powder Specification: 1 # - 30 # Size: diameter: 3 mm / 0.1"; length: 45 mm / 1.8" Package: 1 box (30 per box) Features:1. Mainly used for carving glass， jade， inner hole grinding， repair abrasive tools and hard objects. 2. Suitable for: electric grinder， engraving machine， assembly of electric machinery. Note:There may be a slight color difference because of computer monitor and light.