The 3/8” staples are compatible with the M68E Spec Ops Plier Stapler. The longer leg length makes these staples perfect for stapling through thick cardboard packages when boxing things up for storage. They have a crowned design for maximum drive with extreme holding power for all insulation purposes. These staples will keep packages together for shipping and storing purposes. With each Spec Ops Tools purchase made, we support our nation’s heroes by donating 3% of proceeds to veteran and first responder causes.