New Old Stock. Master Mechanic Asst'd Carbide Grit Jig Saw Blades for 1/4" Universal Shank. Specifications include: 2 pieces of Part Number 280-834 (4" medium), 2 pieces of 2 7/8" coarse 280-826, and 1 piece of 2 7/8" Coarse 280-602. Five pieces total.