Compactor set that facilitates hand compaction of 4" Marshall specimens. Set features ASTM-compliant oak pedestal with hammer support rod, which holds hammer in perpendicular alignment to base during compaction. Also features a mold holder, which keeps the mold securely positioned during compaction. Set includes: H-1340G compaction hammer; H-1347 pedestal with ASTM-compliant steel plate; H-1341A compaction mold; H-1343 compaction mold holder; H-1345.6 hammer support rod, and H-1345.5 adjustable guide. Additional mold and hammer assemblies are recommended for efficient testing operations, allowing you to preheat multiple molds and hammers to speed testing.