Abstract: A mine tool roof bit insert has two flat parallel sides extending in the long dimension of the insert and has two uppermost slanted surfaces extending between the two flat parallel sides. There is a trough at the top of the insert, which is between the two uppermost slanted surfaces and which is substantially orthogonal to the two flat parallel sides.

Abstract: In a rotatable cutting bit of the type for delivering water under pressure to the work area being cut, the head portion includes an annular recess including a plurality of outlet ports facing forwardly and protected from the rearward flow of material being cut.

Abstract: A roof drill assembly comprising a roof drill having a drill bit of a cylindrical configuration when used with a specifically designed drive rod and a means for retaining the drill bit within the drive rod enables a better dust removal during drilling and an increased load carrying ability of the shank. The drill bit body has two opposing symetrical lands including a web of uniform width extending across the diameter of the cylinder. The configuration forms a specific point angle, a chisel edge angle and a rake angle. The web contains a refractory metal carbide as a cutting surface and a shank extends from the body to engage a drive rod. The drive rod contains a tubular portion having an outer portion diameter compatible with the drill bit and an inner diameter to provide dust removal. A transition portion contains two channels that communicate from the opposing walls of the transition portion to the inner opening in the tubular drive portion that extends from the tubular portion.