Hardened spring steel blades are fixed to the stock with self-locking tapered rivets to insure permanent accuracy. The case is a softwood and plywood construction.
It has been used by engineers, architects and draftsmen for decades. The round head locking type protractor will give you accurate measurements every time so you can get your project done on time. Round Head Locking Type Protractor.
Plastic 8" Goniometer 360 Degree Physical Therapy Angle Protractor.It's an easy way to gauge recovery after surgery or physical therapy. The arm's ruler features both inches and centimeters. TRANSPARENT FOR EASY READINGS - The clear plastic of the goniometer allows you to place the device directly on a joint or limb for easy observation.
Designed to be long lasting, this machinist square also has a 0. This square comes with a 90 degree angle and measures 16 x 10 in.0024 inch squareness tolerance for both inside and outside measurements respectively.in length.