Advantages of a sophisticated double-guided snail: high spectrometry, with a cleavage adjustable to 0. 01 ~ 0. 03 mm; steady contact with the tooth, without altering the centre distance. Adjusting criteria to be reliable. When assembled flexibly and assembled, the adjustment ring is used to obtain a suitable rim. In use, if wear and tear lead to an increase in the transmission gap, it is more practical to adjust the axis position of the snail so that the snail wheeling subprecision can be restored to its original accuracy without the need to replace the new snail, the snail wheel. The snail mass uses 40cr, 42crmo, 38crmoal alloy steel. The snails are made of tin copper zcusn10pb1 centrifugal, with a high degree of resistance. Advantages of a layered, fine-modified snail pole: high spectrometry, low noise, long life. Installation is easy, while precision adjustments are simple and do not require centre spacing. Low pressure angle, higher teeth, high exposure factor. Solid-axis-driven snails with hollow axes absorbing the reversible impact of the snail. The back cone is much greater than the working surface pressure to enhance the strength of the cortex. It can be used for split tables, reverse tables, cnc axes, horn-sharping, flushing, telemetry test machines, high-precision partitioners, etc., for precise positioning of motion around no gap。