K.8411, K.8404 and K.8421 have 39" key tip shafting.K.8411 has H.30 Handpiece, K.8404 has H.44T Handpiece, K.8421 has H.43T Handpiece. K.8434 includes a H.44T Handpiece...
K.8413 has M.TX equipped with 66" long non-conductive shafting and C.TXR speed control in plastic housing K.8414 has M.TX equipped with 66" long non-conductive shafting...