The drawing is showing that four roll or dowel or gauge pins are present and they all share the same 0.250" diameter. The 10° taper of the part makes taking a dependable and repeatable measurement difficult. So the gauge pins are used to ensure a consistent measurement.
This is actually a fairly common practice for tapered parts.
Basically, in order to measure the part after it is manufactured you would get 4 "rolls" (I assume that the industry that the drawing is used in would know what a roll is), place them where the drawing says to place them (looks like tangent to the 1.248 dimension) and then the height should be 2.285 +0.000/-0.018.
Thank yall so much!