15 and will produce a sound by the jump of the pointed portion 161 against the ratchet 221 there are 4 arced projections 222 formed on the outer surface at the rear end of the connecting member 22 of the mount 20 for securing on the flange a when the mount is inserted into the main body referring to fig1 and 2 to use the present invention the mount 20 is inserted into the locking hole 13 on a main body 10 which is a very simple structure in contrast to the three part display bracket of the prior art as shown in fig5 the display bracket for a wrench further has the function of preventing theft in an exhibition in this present invention beneath the main body 10 there are a pair of retaining holes 11 for securing an u03c9 shaped retaining plate 40 therefore a wrench displayed on the bracket is hard to steal moreover the middle bulged section of the retaining plate 40 may provide the ratchet wrench 30 with a left angle pre setter and a right angle pre setter so that a range of angular displacement can be set referring to fig3 a 3b 6 and 7 as the connecting member 22 of the mount 20 is inserted into the locking hole 13 the ratchet 221 on the outer surface of the top end of the connecting member 22 will engage the pointed portion 161 atop the flexible piece 16 as shown in fig3 b thereby when a ratchet wrench 30 is rotated in a reciprocated way the mount 20 rotates accordingly and the ratchet 221 of the mount 20 will urge the flexible piece 16 to jump back and forth creating a quivering on the hand of a.