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You are here:Home > Hammer Drill Bits > Praxis Extension Hammer Drill Bit System
The Driltec Praxis extension bit system allows you create rotary hammer drill bits in lengths from 19 inches up to 7 feet simply by adding extensions. Designed for SDS Plus, SDS Max and Spline Hammers. First select appropriate shank, add desired extensions and then choose your bit diameter. Diameter range from 3/4" all the way up to a massive 2" bit.