【High Quality】Made of special ABS material, clear, precise and easy to read. Used for dark fluorescence. 【Easy To Read】Hollow plastic housing can read line level from top, side or bottom and also makes it lightweight to reduce line sagging for accurate reading. 【Anti Drop Design】Specially designed forward and reverse hooks can ensure that the product is stably hung on the construction line and not easily dropped. The open type allows the mini bubble level to slide freely along the lines. 【Wide Application】Widely used in bricklaying, plumbing, gutter, tile construction industry engineering measurement equipment adjustment Angle balance measurement. 【CLIP & V-GROOVE】This hanging line level has a clip for attaching to a pocket, easy to take and store when working. V-shaped groove at the bottom provides reliable seating when leveling round items such as pipe, conduit, and shafts. Hanging Bubble Line Level String Level Tools - 16 Pcs