Coilable rule

In a coilable rule including a casing having a slotted arcuate front wall provided with an opening forming a mouth adjacent the lower edge thereof and a flat bottom wall, a measuring tape blade coilable in the casing, a brake member for releasably holding the tape blade against unintended movement from a desired extended position, said brake member comprising upper and lower arcuate portions with shoes at the ends thereof and an intermediate offset finger piece connected thereto by a necked down web received in the slot of said front wall of the casing to cantilever mount said upper and lower portions on said casing for slideable movement toward and away from the tape blade between locking and unlocking positions and to bias said lower arcuate portion of the brake member into engagement with said tape blade at an acute angle to the coiling direction of the tape to clamp the blade against the flat bottom wall when said brake member is in its locking position, the improvement wherein said upper and lower arcuate portions are mirror images of each other and the shoes thereof project radially outwardly from the ends thereof, respectively, and said front wall further provides a pair of spaced recesses which cooperate with the shoe of the upper arcuate portion to detent the brake in both the locking and unlocking positions thereof.