Concrete drill bits, hex shank, 3 pieces. Manufacturer: Unika, Drill bit diameter (mm): 10.5, Overall length (mm): 505, Used a few times. Shows signs of use, but the cutting edge is still in good condition. Manufacturer: Shinkoh Kogyo, 21.5mm, 505mm, Used a few times and has some rust, but the cutting edge is still in good condition as you can see. Manufacturer is uncertain, but possibly (Super) Light Seiki? 17mm, 505mm, Unused. The cutting edge is clean as you can see. These are a set of 3. Price is 1,000 yen per drill bit x 3, plus shipping.