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HM-48A Tamping Rods List Price: $15.00 HM-48 Tamping Rods List Price: $19.50 HM-47 Tamping Rods List Price: $7.00 HM-48A Tamping Rod is used when forming 6x12in cylinder specimens and for many other tests. It measures 24x5/8in (610x16mm), LxD. HM-48A is plain, with no markings. HM-48 Tamping Rod is used when forming 6x12in cylinder specimens and for many other tests. It measures 24x5/8in (610x16mm), LxD. HM-48 model has imprinted measuring scale in 1/4in increments. HM-47 Small Tamping Rod is required when molding 4x8in concrete cylinder specimens, and are 12x3/8in (305x10mm), LxD. HM-63 Tamping Rods List Price: $8.00 HM-63 Long Tamping Rod is 18 x 3/8in (457 x 10mm) LxD and meets both Canadian and ASTM Standards for Consolidation of 4 x 8in (102 x 203mm) Concrete Cylinders.