On-Size bushings are for fixtures used at temperatures up to 750°F (400°C), as in autoclave curing. The precision bushings are used with Bullet-Nose Dowels to align two pieces of a fixture. Made of Invar, a 36% nickel-iron alloy with a low coefficient of thermal expansion, On-Size bushings are for applications requiring minimum thermal expansion and high dimensional stability. Available with or without heads, bushings come in four sizes in inch or metric sizes. Carr Lane Mfg.