Hilman Rollers OT/NT/T Series The OT/NT/T Series Rollers are a standard design basic roller that can be used for permanent or semi-permanent applications. Mounts allow for one or more modifications on all three styles. T Series Rollers have standard sized tops that are flush on all sides; ideal for cavity mounts. T Series 15 Ton T Style Roller - 10. x 5.19" x 3.88" (lwh) - 38 lbs" Hilman Rollers 15 Ton Capacity T Style Roller 15-T