Magna-Stitcher™ Plastic Repair Kit for Stud Welders Fits all popular stud welder brands. Turns your stud welder into an economical plastic repair system. Works by welding a rigid stainless steel stake into the surface of the plastic resulting in a permanent repair of the crack Kit includes:. (1) Magna-Stitcher™ adapter. (25) S shaped stakes for flat surface repair. (25) M shaped stakes for tabs and narrow sections. (25) V shaped stakes for inside corner repair. (25) W shaped stakes for outside corner repair. Storage case MS-1-KIT No -