Radium Engineering Billet Aluminum ClampsThese anodized billet 6061 aluminum clamp style mounting brackets were designed for components such as fuel filters, oil catch cans, external fuel pumps, etc. The large inner diameter(s) measure 60mm which matches a Radium Fuel Filter and or Bosch 0 580 254 044 fuel pump(s). Unlike others on the market that use insulating rubber, these clamps transfer thermal energy into the chassis effectively reducing fuel pump temperatures and extending service