This 45 degree x 5/16" blade is for the Akiles Diamond-1 corner cutter. It clips off a 45 degree corner with a set-off distance 5/16 inch from edges. This blade works with all standard materials, including PVC, polyester, leather, and paper. It will provide effortless cutting through up to 60 sheets of 20lb stock at a time.(Old P/N CR3555)