Set includes 3.23, 3.30, and 3.45mm sizes (.127, .130, .136) Set includes 3.23, 3.30, and 3.45mm sizes (.127, .130, .136) Investment cast, heat-treated tool steel wrench features 3 side and 4 side opening Durable plastic handle reverses to provide ideal ergonomics with either opening Precision cut wrench openings are perfectly sized for fit and speed.