Duo fast coil nail cs 171 2-1/4 x. 099 7,200per box plastic : duo-fast: rcn60-225adj, rcn70-60, df225 older models : kdn-50a, rcn-60/225, rcn-60/225nm, rcn-70/60a, rnc-70/275a, rcn-70/275, rcn-70/60, rcn-75/300.