6 Class 6: Metal castings namely, aluminum extrusions being metal castings, metal casting being gravity casting, investment metal casting, sand casting being metal castings; metal casters, namely, moving cart casters, scaffold casters, heavy duty casters, industrial casters; metal locks, namely, RV locks, patio door locks, paddle locks, tubular door locks, level door locks, tulip door locks; springs namely, metal gas springs for lifting and counterbalance in automotive and aviation manufacturing, non-electric door springs of metal; metal labels namely, labels and graphic overlay for membrane switches; outdoor storm door hardware namely, keys and key cylinders; metal door component parts, namely, non-magnified metal door viewers, striker plate being strike plates of metal, metal screen door handles, chain slide bolt, metal screen door roller, spring-loaded door closers of metal, door stops of metal, chain hoist used for lifting and rigging; sliding door hardware, namely runners of metal for sling doors, metallic frames for sliding doors; metal window component parts namely, namely, window rollers, wool pile window latches being locks, corner keys; metal parts for exercise equipment namely, metal shackles and hooks for lifting and rigging being bow shackle bumper plates, window frame covers for use in covering weep holes, window balances being rubber vinyl balance system keeper; fastener being mechanical fastening elements of metal; stair treads of metal being aluminum tread steps