Engelhardt Original Cello Pegs. These are used pegs from a repair shop. According to Engelhardt, pegs were a standard size on the model 55 cellos. These should fit all size instruments with the "large peg head" The shaft size was measured with a digital caliper(shown in photos) All of the pegs are 13mm below the peg head. The taper, depending on length, goes down to 10.7.