disclosed are pliers and related methods for punching a hole in a non - flat material without distorting the material . such pliers may comprise a first member having a first handle and a first jaw , and a second member having a second handle and a second jaw . the first and second members are attached at a connection point to permit pivoting in response to a squeezing force on the handles . the first jaw comprises a punch tip to be received by the second jaw , where the punch tip may have an angled distal end truncating a cross - section of the punch tip . the second jaw comprises a shaped edge facing the punch tip and extending along a length of the second jaw , the shaped edge having substantially the same shape as the non - flat material and comprising an opening having substantially the same shape as the cross - section of the punch tip and to receive the tip therein .