12 pcs Combination Wrench SetThe 72 tooth box end needs a minimal 5 to move fasteners vs 30 for standard wrenches Off corner loading design on box end provides better grip and reduces fastener rounding The Combination Wrench Set has pass thru technology works down any length of threaded rod and long bolts Thin head and beam provide greater access in confined work areas Plastic Wrench Rack included for tool retention and storage