https://www.slb.com/products-and-services/innovating-in-oil-and-gas/well-construction/rigs-and-equipment/pressure-control-equipment/bop-rams/high-temperature-variable-bore-rams
High-Temperature Variable-Bore Rams | SLB
Provide a seal to a range of diameters, and are suited for H2S service per NACE MR0175 and compatible with U surface ram-type BOP.
variable bore ramshigh temperatureslb
https://www.camtop-oilfieldtools.com/1003/pipe-rams-vs-shear-blind-rams-vs-variable-bore-rams/
Pipe Rams vs. Shear Blind Rams vs. Variable Bore Rams: Choosing the Right Ram Type | CAMTOP
Mar 11, 2026 - Compare pipe rams, variable bore rams (VBR), blind rams, and shear blind rams for your BOP stack. Understand working principles and selection criteria from...
the rightpiperamsvsshear