The PROLOCK PLK06 (93179) non-marring caps bring an added level of layered protection to your Prolock foam or gel kneepads. Unlike other armor-like hard caps, these caps are made of a flexible thermoplastic elastomer (TPE) to protect your knees while shielding hardwood and tile flooring from damage. Attaching them to your existing Prolock kneepads is simple and tools are entirely optional, just twist the four thumbscrews into their corresponding anchors either by hand or with a hex key or Allen wrench for a secure fit. Remember, when a task calls for working on your knees, let PROLOCK knee pads take the strain so you don’t have to.