Dual function: rerounding and interior reamer. 4 diameters per product to calibrate the most frequently used dimensions. Two vital functions prior to press fitting of multi-layer pipes. 1- Rerounding the tube after cutting operations. 2- Ream the inside of the tube to avoid damaging the connector’s o-ring. Strong product, burnished steel body, hardness 95 HrB. Practical plastic handle. Ext dia & pipe wall thickness 16x2 - 20x2.5 - 26x3 - 32x3.