... trailer-mounted drilling rig 1.standard:API Spec Q1,4F,7k,8C 2.competitive price 3.deliver promptly 4.High quality service trailer-mounted drilling ... rigMain technical specification for trailer-mounted drilling rigs ModelZJ20/1580CTZJ30/1700CTZJ30/1700DBTZJ40/2500CTZJ40/ ... pressure of the air system (psi)143 trailer-mounted drilling rig