Handpiece Maintenance Overview with Melissa Muir. Key Tip Handpieces - the widest choice of handpieces have a Key Tip connection to a standard 'Key Tip' style shafting. Foredom offers 17 different General Purpose, Quick Change, Special Use, and Duplex Spring Handpieces. Square Drive Handpieces - 4 models for attaching to heavier, square drive shafting (comes on Series SRH, TXH, LXH motors). Slip Joint Handpieces - 9 models for attaching to European-style slip joint connections.