Prodent USA Bone Expander Kit in Stainless Steel Case. Includes 5 color coded expanders in the sizes 2.6, 3.0, 3.4, 3.8, and 4.3mm, 1 ratchet wrench, 1 extender, 1 pilot piece connector, 1 thumb knob, 1 handpiece adapter, 2 pins, 1 stainless steel case to hold and sterilize the kit. Expanders are marked at 4, 6, 8, and 10mm and can be driven into the bone using the included ratchet or a low-speed hand piece.