jumbo e2c зарна
jumbo e2c зарна; Jumbo HSS | Atlas Tube. Find details and complete specs for Atlas Tube's Jumbo HSS, ranging from 18" to 22" square. Jumbo HSS meet ASTM A500 and CSA G40.21 standards. Rotary Drill Bits - KC Bit. IADC: 2-1 to 2-4. Rock Strength/UCS: 3,000-10,000 psi / 20-79 mpa. Weight on Bit: 3,000 to 6,000 (lbs/inch of bit diameter) …