Meets ASTM D-558, D-559, D-560, D-698, D-1557 and AASHTO T-99, T-134, T-135, T-136 specifications.
Compaction hammers are machined from steel and plated for rust resistance. 10 lb. (4.5 kg) hammer has a drop of 18" (457mm). 5.5 lb (2.54kg) compaction hammer has a drop of 12" (305mm). Guide sleeve has four vent holes in each end of sleeve to release built-up air pressure.