H-610-16P.. 16mm Champ Full Mortise Concealed Cylinder Hinge. Just drill the 16mm hole, insert, then turn the set screw and the cylinder expands within the hole, securing hinge in place! Machined solid brass with steel linkages Drill 16mm size holes to exact depth.16mm x 1-1/16″” long for 7/8″ wood. 16mm=approximately 5/8″. Works great on things like butterfly table table leafs. Sold individually.