The PG750X Duo is a two in one drill - simply reverse to drill 6 or 8mm holes. Drills up to 100 holes in grade 5 porcelain tiles dry due to the self lubricating technology and vacuum deposited muti layered diamond. Self cools and sharpens, leaving clean precise holes in any tile however hard including natural stone, ceramic, marble, terracotta, granite and porcelain. Ideal for corded and cordless drills.