Four roller tracks specifically designed for professional use|Replaceable scoring wheels also available for 1/2 in and 3/4 in EMT (Cat. No. 88907) and 1 in EMT (Cat. No. 88908)|Klein designed, patented scoring wheel scores snaps conduit without leaving burrs inside|Durable zinc cast scoring tool eliminates spiraling|One scoring wheel conveniently located in base of the handle, no tools required to replace scoring wheels