Ironwood Pacific Top-Snapper Snap Tool For Boat Canvas Snaps with Easy-to-Grip Handle and Dual Stainless Steel Blades Align and fasten inside and outside snaps; undo snaps without damaging canvas Works on corroded snaps and shrunken canvas Comes with two stainless steel blades, one for inside snaps and one for outside snaps Super comfortable molded plastic grip with a wrist lanyard Lifetime warranty