Adjustable Clamp Frame

One side of the glass is etched to be used with lapping powders to flatten the sharpening stones

Tsushima Nagura has one side ready to use

white color with dark dots

the photo does not exactly match the original

baikalite stone edge pro bestseller Adjustable Clamp FrameBaikalite sharpening stones are used for finish sharpening and honing knives on Hapstone Pro and Edge Pro sharpeners. Baikalite is a naturally abrasive material of high density. Baikalite stones are mounted on high quality aluminum blanks. Baikalite is mined in the Baikal region of Russia. Baikalite is a dense, opaque variery of silica rock. Specification Product size: 160 x 25 x 9 mm (6" x 1" x ") Working surface: 152 x 25 x 6 mm (6" x 1" x ")