Symmetric is a system comprised of an ingeniously simple concentric method of drilling through overburden with casing
Eccentric is the most economical solutions because its ingenious reaming wing the bit is retrievable can be used at the next hole
Sinodrills DTH bits are made of superior quality alloy steel which is made in U.S. Besides, all our DTH bits are using the premium T.C carbide which provides (the T.C buttons) for famous brand