Katzco 3pc Magnetic Bit Holder Extensions 2-4-6" Quick Change 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 Strong permanent magnets hold bits securely in place; accepts all 1/4" hex-shank bits Extensions in lengths 6", 4" & 2" for superior access for hard-to-reach fasteners Must-have accessory set for power drills and impact drivers