Ehwa Diamond Industrial Co., Ltd.

Sung-Hoon Chung

Ki-Ho Kim

Jae-Hyun Hong

Jong-Suk Choi

Young-Choul Song

Disclosed herein is a grinding tool, which includes a plate, a plurality of holders formed on the plate and having sliding grooves, a shoe coupled to the sliding groove of each of the holders, and grinding tips arranged on the shoe. The shoe includes a fastening part fastened to the sliding groove, and an upper plate part formed on the fastening part and located on an upper surface of the holder outside the sliding groove. The shoe can be fastened to the holder in two or more directions, and the grinding tips can be arranged in two or more forms when viewed from the plane.

Grinding tool

A reaming shell for mining is provided. The reaming shell has a shank, and a plurality of pads attached at circumferential intervals from each other to extend lengthwise on an outer periphery of the shank. The reaming shell is coupled to a core bit of a diamond drilling tool for mining. The reaming shell includes a water groove of a recessed shape formed respectively between each adjacent pair of the pads, and extending from a leading edge along a length of the shank.

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Irvine, CA, United States of America

Sung-Hoon Chung