This Handle Bar Clamp is designed to be used with all Houser Racing Anti-Vibe Steering Stems. The Regular Clamp is designed to work with 7/8 inch diameter handlebars. The Oversized Clamp is desinged to work with 1 1/8 inch diameter handlebars. The mounts have 4 rubber cones that create vibration isolation between the stem and the handlebars. The Clamp is fully CNC machined out of billet aluminum. The upper Dog Bone portion of the clamp is designed to be strong and also has 4 threaded holes so a Pro Design Kill Switch or Houser Racing Dashboard can be mounted.