ITW Red Head 303 S.S. Multi-Set Drop-In Anchor. Drop-In, shell type anchors feature an internally threaded, all-steel shell with expansion cone insert and flush embedment lip. Anchors are manufactured from zinc-plated carbon steel, 18-8 stainless steel and 316 stainless steel. Anchors should be installed with carbide tipped hammer drill bits made in accordance to ANSI B212.15-1994 specifications. Anchors should be tested to ASTM E488 criteria and listed by ICC (formerly ICBO). Anchors should also be listed by the following agencies as required by the local building code: UL, FM, City of Los Angeles, California State Fire Marshal and Caltrans.