FEATURES Slider has an internal locking mechanism that stays in place even with pressure to the zipper. Made for plastic style zipper teeth
USES #5 size is ideal for repair or sewing into jackets, backpacks, sleeping bags, tents, purses, duffle bags, upholsery. 8-10 size is ideal for repair or sewing into wetsuits, life vests, boat covers, canvas tents, soft tops, and heavy duty clothing