Roll Bars are fabricated from the highest quality seamless tubing and T-304 Stainless Steel Tubing Attractive and durable black powder coated finish Complete instructions and hardware kit with grade 8 bolts and 3/16"" mounting plates Harness tabs are standard on the M2 bar Top Boots & Tonneau Covers will require modification to fit Limited seat travel and tilt Fitments available for hard tops or soft tops with glass or plastic windows. Hard top fitment places hoop slightly further back and is not as tall as soft top fitment, may be preferable for taller drivers Tubing is 1.75"" Diameter x .120"" wall thickness SCCA & NASA Approved Add a bolt-in harness bar designed for competition harness wrap-around shoulder strap attachment. Also made by Hard Dog for use with any version of Hard, Sport or Hardcore roll bars. powder coated black 1.5"" OD x .120 wall DOM tubing, allows for complete use of hard top, soft top and all glass rear windows.