The Shifter Mount gives you the possiblity to mount the Ruff Shiter on most tubes of your bike (Depending on the thickness of the tube). So with the mount kit you have a wide array of placement possilbilites.Its CNC machined from 6061 Aircraft Grade Aluminium.The Shifter attaches to the existing Grip Shift, see list with matching types below:Shimano Nexus 3: SL-3S41ESL-3S35SB-3S30Shimano Nexus 7:SL-7S30SL-7S30-A