that tip 29 extends forwardly more than upper blade 17 from forward end 15 the junction of inboard side 27 with wedge surface 31 is approximately in vertical alignment with the junction of upper shear blade upper edge 19 and outboard end 24 wedge surface 31 joins inboard side 27 approximately the same distance from upper ram block forward end 15 as the distance from forward end 15 to the upper edge 19 of upper blade face 23 at outboard end 24 each guide atm 25 has an outboard side 35 that extends from arm base 37 to tip 29 outboard side 35 may be at an acute angle relative to longitudinal axis 28 in this embodiment the acute angle is about 15 degrees relative to longitudinal axis tip 29 has a smaller height and width than base 37 fig4 shows a lower side 39 of each arm 25 lower side 39 is shown as being flat and in a plane parallel with upper side 33 fig3 a beveled surface 41 may join an outboard edge of lower side 39 with outboard side 35 beveled surface 41 is shown to be in a plane inclined relative to horizontal referring still to fig4 and also to fig5 the lower side of upper ram block 13 has a sheared pipe end recess 43 recess 43 has a rear wall portion 45 that joins side wall portions 47.