20pcs 4-40mm Diamond Hole Saw Drill Bit Set for Tiles Ceramic Glass Marble

Description: 20pcs 4-40mm Diamond Hole Saw Drill Bit Set for Tiles Ceramic Glass Marble Specification: Material: Diamond Color: Silver Length: 50mm/1.96" Drilling size: 4/5/6/7/8/10/12/13/14/15/16/18/20/22/25/27/30/32/35/40mm Quantity: 20Pcs Features: -Cut resistance is small, improve the opening speed, slotted easy to decorate, chip removal easily. -Opening neat, smooth, no broken edges, will not produce tremor. -Can be used for glass, ceramics, marble and other hard and brittle materials, drilling, grinding Buddha beads, jade and so on. -Instructions for use: -Glass drilling device is installed in the use of ordinary hand drill (electric drill to speed better) because this hole is not the central positioning of the drill bit, be careful when operating, let the hole at a slow slow access to glass Useless side of the hole out of a crescent, and then put a bit is used to locate the crescent, so you can successfully complete the hole operation. -Note that when the hole in the speed can not be too fast, must be slow, in the process of opening the hole must be added water cooling device. Package Included: 20 x Hole saw More Details: