Master Sensor Socket Kit 7pcs 1/2'' Drive x 27mm (12 point) oil pressure sending unit socket. 1/2'' Drive x 29mm (6 point) pressure/vacuum switch socket with slot. Oil pressure sending units on late 1980 and mid 1990 GM vehicles. Designed to be used with 1/2" drive tool. 1/2'' Drive x 7/8''or 22mm (6 point) long oxygen sensor wrench socket with slot. 3/8'' Drive x 7/8'' or 22mm (6 point) vacuum switch socket with slot. 3/8'' Drive x7/8'' or  22mm (6 point) vacuum switch socket with slot. 3/8'' Drive x 1-1/16'' & 1''or 27mm (6 point) oil pressure sending unit socket. Special deep design fits oil switches up to 2-5/8". Can be used with a 3/8" drive ratchet or 1-1/8" wrench. 3/8'' DR x 7/8''or 22mm (6 point) short oxygen sensor wrench socket with slot.