The trailing arm on your Polaris RZR XP 900 is vunerable to all hazards you face while out on the trails. The trailing arm drops down below the frame while crawling and trailing riding, leaving them open to get hit by every obstacle you come across. The UTV INC 3/8" UHMW Trailing Arm Slider bolts over the trailing arm to provide protection for both driver & passenger side trailing arms. These are machined in house from a 2" x 5" solid block of UHMW to ensure the proper contours align with your OEM Polaris RZR XP 900 trailing arms for an easy install. This process also ensures the sliders are the THICKEST at the corners and the bottoms of the guards. Grade 8 hardware and Nylock nuts are included for installation.