· 1-pass fasteners - clip sits in the groove of the board until you're ready to fasten· Use with grooved composite, PVC and hardwood boards· Clip body creates 3/16 in. (4.7 mm) spacing· 305 stainless gusset, 410 stainless drill point screw, nylon plastic spacer body· Fasten with included never-miss guide or while standing up with the CAMO Clipdrive or Drive· Clip prongs fit into boards' groove· Pre-assembled clips do not require partial installation - they stay in place in the groove until you're ready to fasten