The DU style slip is designed for long trouble free service. They are made of alloy steel and heat-treated for strength and resistance to wear. The DU Regular has a 12″ long gripping surface and designed for wells 8000′ or less. The DU long has a 16″ gripping surface and is designed for deep wells and heavier drill strings.
The Woolley B style slip has a unique torque transfer slot preventing excess wear and pressure. The inserts are designed with flat backs so the load is transferred to the slip body. Slip inserts are easily replaced with the removal of one retaining pin. The Woolley B comes in three sizes; short, long and extra long.
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