Used to determine initial and final set times of Portland cement, masonry cement, hydraulic hydrated lime and certain mortars. Comprised of two stainless steel needles with 0.0375″ (4.8mm) cylindrical flat-end needles. One is 1/12″ (2.12mm) dia. 1/4lb. (113.4g) weight for initial set. The second is 1/24″ (1.06mm) dia., 1lb (453.6g) weight for final set.