Remember when you could calibrate equipment, space workpieces, and collect exact measurements all with one tool? Maximize accuracy with the WEN 1-2-3 Blocks. With one side measuring exactly 1 in., one side at exactly 2 in., and a third side at exactly 3 in., you'll be able to ensure accuracy on every project. Made from heavy-duty hardened steel, the WEN 1-2-3 Blocks have been machined to be perfectly square, with 5 tapped holes (3/8-16 UNC) for bolting, drilling, hammering, or whatever else you need them for. This pack comes as a set of two, turning your 1-2-3 blocks into 4-5-6 blocks. Remember when you could have faith in your measurements? Remember WEN.