3M Block Fork Vinyl-Insulated Wire Range 12-10 Stud Size 8 Yellow, color-coded for quick and easy identification of the wire size required. It has a brazed-seam barrel that is covered by a funnel-designed, rigid-molded, polyvinyl chloride sleeve to guide the wire into position while providing electrical contacts and mechanical stress relief at the point of insulation. The abrasion-resistant, flared, vinyl-sleeve insulation ensures easy crimping.