order no. Specification Specification 550-1001 1/2''''(12mm) 3/8''''9PC 550-1002 3/8'''' 1/2''9PC 550-1003 5/8'''' 5/8''''12PC 550-1004 3/4''''(18mm) 3/4''''12PC 550-1005 1''''(25mm) 1''''7PC