The RJ45 crimp tool from Stewart (Pt No 1955) incorporates a high quality ratchet controlled crimping operation. It is for use with the standard UTP RJ45 plugs (Pt No 1390). A separate tool is required for the Enhanced Cat.5 plugs (Pt No 1390HQ). Each is supplied with the appropriate die with replacement dies listed. The economic tool (Pt No 1381) does not allow die inter-changeability & is ideal for light to medium manufacturing work loads whereas Pt No 1384 covers RJ45, RJ12 as well as UK telephone style terminations.