RCBS MatchMaster Duo Die Set 6mm ARC Black None. Duo pairs RCBS's premium MatchMaster Seating Die - engineered for micrometeradjustable repeatable seating depth - with a rugged RCBS Full-Length Sizing Die trusted by generations of reloaders. Specifications for RCBS MatchMaster Duo Die Set: Manufacturer: RCBS Color: Black Fabric/Material: Steel Features of RCBS MatchMaster Duo Die Set MatchMaster Seating Die + Full-Length Sizing Die No bushings required Package Contents: RCBS MatchMaster Duo Die Set RCBS 28004: MatchMaster Duo Die Set 6mm ARC Black None