The Stedi-Rest is used in combination with a mahl stick (sold separately) to steady the hand for detailed brush strokes that require precision. 10 conveniently spaced slots enable you to position your mahl stick at the angle needed. The Stedi-Rest is made from neutral grey high impact plastic with a universal clamp that attaches to the left side or right side of your canvas frame. It works equally well for right or left-handed use. The universal clamp can grasp any substrate 1.88in (4.77cm) wide or less. 16.5 inch length and 0.20 pounds. Made in Pennsylvania, USA