This useful set enables you to use sockets with one drive size on ratchets and handles with a differnt drive size. 6 sizes allow you to use 1/4" drive sockets with a 3/8" drive handle, 3/8" drive sockets with 1/4" or 1/2" drive handles, 1/2" drive sockets with 3/8" or 3/4" handles and 3/4" drive sockets with a 1/2" handle. 3/8” (F) – 1/4” (M), 1/4” (F) – 3/8” (M), 1/2” (F) – 3/8” (M), 3/8” (F) – 1/2” (M), 3/4” (F) – 1/2” (M), 1/2” (F), – 3/4” (M) *This Clarke Pro hand tool comes with a Lifetime Guarantee (excludes ratchet mechanisms where applicable) see product packaging for full terms and conditions.