Bordo's 3/8" x 300mm quick change extensions suit all accessories with 3/8" shank and power groove. Join multiple extensions together for extreme reach. Extensions are securely joined together by rotating the threaded quick change locking collar. Extends your reach up to 1,700mm. Set contains 1 x 25mm high carbon steel, heat treated Auger Bit with coarse screw point and 6 x 300mm Quick Change Extensions.