The Syndyt PRO Tensioner Kit includes stainless steel, M6 threaded tensioner screws with a cradle to match directly with a 20mm axle or one of the (included with the frame) 10mm or 15mm axle adaptor kits. The black anodized adjuster knob is made from aluminum and threads over the tensioner screw. The M6 stainless steel set screws are used to lock down the adjuster knob once proper tension is achieved.