These Grade AA (Laboratory Grade) granite parallels and pairs are used for setting up workpieces on surface plates and machine tables. They are also used to elevate workpieces above the surface of a plate for quick and easy inspection of piece parts with shoulders or steps. They are durable, corrosion-resistant, and tolerate temperature fluctuations. Grade AA parallels and pairs are commonly used for the highest degree of accuracy and are often used in calibration laboratories and high-precision metrology and inspection labs.

Grade AA (Laboratory Grade) granite tri-squares have three sides and are used to check the X, Y, Z axes on CNC machine tools and coordinate measuring machines (CMM). When used in a horizontal position, they can check the X and Y axes for 90° squareness. When used in a vertical position, they can be traced along the edge to check the perpendicularity of the Z axis. They are also used for checking general squareness and straightness. They are durable, corrosion-resistant, and tolerate temperature fluctuations. These grade AA tri-squares have the highest degree of accuracy and are often used in calibration laboratories and high-precision metrology and inspection labs.

Grade A (Inspection Grade) granite straight edges have a long and narrow face with a flat finish. These grade A straight edges have a medium-level tolerance and are accurate to 0.000050 inches per 6 inches overall length. They are durable, corrosion-resistant, and tolerate temperature fluctuations. Grade A straight edges are commonly used for on-the-floor applications such as layout and alignment during setup on a CNC or CMM machine. Inspection granite tri-squares have three sides and are used to check the X, Y, Z axes on CNC machine tools and coordinate measuring machines (CMM). When used in a horizontal position, they can check the X and Y axes for 90° squareness. When used in a vertical position, they can be traced along the edge to check the perpendicularity of the Z axis. They are also used for checking general squareness and straightness. They are durable, corrosion-resistant, and tolerate temperature fluctuations.

These Grade AA (Laboratory Grade) granite straight edges have a long and narrow face with a flat finish. Grade AA tools have the best tolerance and are commonly used in calibration laboratories and high-precision metrology and inspection labs. They are accurate to 0.000025 inches per 6 inches overall length. They are durable, corrosion-resistant, and tolerate temperature fluctuations.

Grade A (Inspection Grade) granite straight edges have a long and narrow face with a flat finish. These grade A straight edges have a medium-level tolerance and are accurate to 0.000050 inches per 6 inches overall length. They are durable, corrosion-resistant, and tolerate temperature fluctuations. Grade A straight edges are commonly used for on-the-floor applications such as layout and alignment during setup on a CNC or CMM machine.

These granite parallel storage cases are padded and hold a pair of specific-sized granite parallels. They are commonly used to protect granite pieces that might be damaged or knocked over when not in use.

These Grade A (Inspection Grade) granite parallels and pairs are used for setting up work on surface plates and machine tables. They are also used to elevate workpieces above the surface of a plate for quick and easy inspection of piece parts with shoulders or steps. They are durable, corrosion-resistant, and tolerate temperature fluctuations. Grade A parallels and pairs are commonly used for on-the-floor applications such as layout and alignment during setup on a CNC or CMM machine.