Must-have accessory set for power drills and impact drivers * Extensions in lengths 6", 4" & 3" for superior access for hard-to-reach fasteners * Strong permanent magnets hold bits securely in place; accepts all 1/4" hex-shank bits * 1/4" quick-change hex shanks fit all power drills, 1/4" impact drivers and hand-held drivers * Hardened tempered tool steel with chrome-finish holders manufacturer"s lifetime warranty