From the Manufacturer
Tormek US-105 Universal Support with Micro Adjust (excl sleeves) is the foundation of the Tormek system. It can be placed for grinding towards or away from the edge. It is made of 12 mm (approx. 1/2-inch) round steel and has a double mounting for maximum stability. The Universal Support incorporates a micro adjust for exact and fast fine setting. It's functions feature: Support for the grinding jigs; Support for the Diamond Truing Tool, ADV-50D; Tool rest when grinding without jigs; Rest for your hands when grinding free-hand; Rest for your hands when grading the stone with the Stone Grader, SP-650. The Universal Support can be placed either in the vertical sleeves or in a horizontal base.
Now With Micro Adjust! The single most requested upgrade suggestion from Tormek owners is finally available - a Universal Support with Micro Adjustment. The micro adjustment feature makes it easy to fine tune a new angle, match an existing edge or make final adjustments using the angle master. It also has a chrome-nickel coating which provides a harder surface with less friction, beneficial when using jigs that glide across the support.