Carry/International Box Basepads for STI/SV. Great for Carry, Fits in IPSC Standard and Modified Box Rule. The DP basepads are designed to give additional capacity while staying very ergonomic for carry application. They fit the IPSC box rule requirement. Above all, they have a toolless design locking key seat cut in the basepad allowing it to be locked in place by the pressure of the mag spring. CNC machined from aircraft grade aluminum.