Feature‎:‎‎-100% new and high quality‎.‎‎-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.‎Specifications‎:‎Product name‎:‎ Drill BitMaterial‎:‎ DiamondsColor‎:‎ SilverLength‎:‎ Approx‎.‎ 50mm/1.96‎"‎Drilling size‎:‎ 4/8/10/12/14/15/18/20/22/30mmQuantity‎:‎ 10PcsPackage Include‎:‎10x Drill Bits