These replacement parts and accessories restore or improve the function of indexable cutting tools. Hardware such as set pins and seats replaces worn or missing parts to avoid the expense of replacing the entire toolholder. Boring bar set pins fasten indexable inserts to the insert seat and toolholder. Insert clamps form a flange that locks inserts in place on indexable boring bar toolholders. Shim seats for indexable cutting tools fit between the cutting insert and the toolholder body to prevent wear on the toolholder. Indexable cutting tool drivers and wrenches tighten and loosen fasteners that secure inserts and other cutting tool components.