Your powder-actuated tool misfired or the fastener floated - the pin did not set and now you have a hole in the concrete and a callback. These .22 caliber powder loads in brown are the charge weight that handles most single-shot fastening into concrete and steel in the 1/2-inch to 2-inch range.100-pack in brown color code. The brown load is the mid-power option in the .22 caliber range - sufficient for most concrete and light steel applications without excessive penetration. Color-coded brown makes identification fast on the job site.Standard on framing crews and concrete contractors from Sioux City to Norfolk - the load weight that handles most single-shot applications without switching charge sizes mid-job.In stock at Crofton Lumber (Crofton, NE) and Akron Lumber (Akron, IA) - ready for Stocked at Crofton Lumber and Akron Lumber.