These reamers feature a longer pilot area and multi-fluted design for perfect guide sizing. Goodson recommends using these reamers at 300 to 400 rpm with Bronze Reaming Oil for best results. At the recommended speed, it should take three to five seconds to ream one guide. Sizes are available from 4 millimeters to 9.6 millimeters. The retail price ranges from $179.99 to $239.99 each.