【Package Includes】5/8"-11 Thread 6pcs 1/4", 5/16", 3/8", 1-3/8", 2", 2-1/2"(6/8/10/35/50/65mm) Drill Bits+1pc 3/8"(10mm) Finger Bit+1pc 2"Chamfer Bit+1pc 4/5"(20mm)Milling Finger Bit+Hex. 【Multiple advantages】 More wear-resistant, more efficient, faster cutting speed and longer life than electroplated diamond bits. Beveling bit: for chamfering, rounding, beveling, trimming and shaping formed holes. Finger milling bit: for enlarging, rounding, grinding formed holes. 【Wide Compatibility】Dry drilling/molding/setting/cutting of various materials, like porcelain, ceramic tile, granite, marble. Dry or wet use. Wet drilling prolong its life. 【Special design】Serrated design allows for quick dust discharge during drilling and is not suitable for clogging. 【Machine】Compatible with most Hand Dril/Bench Drill. Generally hand drills are in 2000-5000RPM, the faster the better, the slower it is the shorter the life span .