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Cutting wheel, or cut-off wheel, differs from grinding wheels in their function and structure. Where grinding wheels use an abrasive to grind large pieces of material off a workpiece from a shallow angle, cutting wheels typically make narrow, precise cuts at 90-degree angles.http://www.winoneabrasives.com/abrasives-wheel/

A Nissan clutch disc is part of the device on a car or truck that is designed to disconnect the motor from the transmission when the clutch is pushed. Because a huge amount of heat is generated when your vehicle's Nissan clutch disc is pressed into the pressure plate, the frictional surface wears off and the clutch has to be replaced.http://www.mhclutch.com/vw-clutch/

Basalt is an extrusive igneous or volcanic rock that has a low silica content, dark in colour, and is very rich in iron and magnesium. Basalt rock is mainly composed of pyroxene, olivine, and plagioclase and is the most common rock on the earth's surface. The texture of basalt rocks is coarsely porous as those holes are left by gas bubbles.http://www.hzxstone.com/sandstone/

Outdoor digital signage is becoming used in recent times. The screen is usually enclosed to make it durable as it's exposed to natural elements like rainfall, sunlight, and dust. It can be used to display price as you have at gas stations, for public awareness of an event or services in the community.http://www.zyodisplay.com/interactive-whiteboard/