Made of flexible rubber, these grips are great for sanding round, curved or grooved surfaces without destroying crispness or detail. Just wrap sandpaper around the profile and begin sanding. The convex set of six includes five grips (1/4" to 1") with a thin hand-sanding pad. The angled set includes four grips (30°, 45°, 60° and 90°). The concave set of five includes four grips (1/4" to 5/8") and a thick hand-sanding pad. Also available as a set of all 15 grips. Well worth the money in saved time and aggravation.