PRODUCT SPECIFICATIONS: This Johnson Level Measuring Ruler measures 0.75 × 5.5 × 16 inches and weighs 12.6 ounces (0.48 kg). CAST ZINC HEAD: The cast zinc head of the combo square acts as a stop; ensuring layout lines are always square to the edges; making it an ideal machinist's square; straightedge; adjustable try square; miter square; marking gauge; and depth gauge. It features a durable acrylic vial, heavy-duty cast zinc head with a black, chip-resistant e-coating finish, and hardened screw-in scriber that won't fall out so that this combo square can withstand even the roughest job site abuse. Heavy-Duty Vertical I Beam Clamp for Construction, Industrial, Home, and Garage - 3 Ton Capacity, 6600lbs, 3.1 to 12.7 Jaw Opening ; Versatile Jaw Range Johnson's easy to use 16" combination square gives you the accuracy and precision you need for every job. Auto-lock™ blade assembly. Stainless steel blade with... Johnson Level 16 X 24 Easy-Read™ Steel Framing Square 16 X 24 It was also designed with maximum accuracy in mind - its Auto-Lock™ blade assembly makes it easier to accurately line up your tool for use. Johnson's easy to use 16 combination square gives you the accuracy and precision you need for every job. Its stainless steel blade has english graduations of 1/8, 1/16 and 1/32 as well as metric graduations that are permanently etched in black for easy readability. Its stainless steel blade features permanent stamped English graduations of 1/8; 1/16; and 1/32 as well as metric graduations for fade-resistance. Level Tool Johnson Level & Tool 420EM-S Heavy Duty Pofessional Inch Square Ruler