MVRK Locking Impact Extensions from VIM Tools are available in sets in 1/4" (5-pc set, No. ILEX400USA), 3/8" (3-pc set, No. ILEX600USA), and 1/2" (3-pc set, No. ILEX800USA), along with a reduced size set that goes from 1/2" drive down to 3/8" (3-pc set, No. ILEX8600USA). The line is American-made and also available in individual extensions if a full set is not needed.