... twist cap, select bit, tilt downward, slide out and lock in place.Great for emergency use, bits aren't loose Material ... for handle Easy to use bit selector with bit storage in handle Chrome vanadium shafts big one contains 3, 4, & 5mm ... one contains 2, 2.5 & 3mm slotted and Ph00, 0 & 1 Philips bits 6 in 1 Quick Change Screwdriver