These handy blind holders are used by custom car builders to hold sheet metal parts before final welding. Very easy to use. Drill a 3/16″ hole through both pieces and insert fastener. Each one provides nearly 20 lbs holding power and has a grip range of up to 1/4″. Includes 10 blind holders, two side-grips for edge work, compression plier to install/remove, and a durable plastic case.