Internal protection: There are steel plate and stainless steel protective cover, organ type protective cover, with a good seal, can prevent iron filings, and prevent coolant.

Internal protection form: armor type, short compression stroke, fast speed, but easy to wear due to thin structure, used in compact space machine tools.

Organ type: The compression stroke is short and fast, and the price is slightly lower. It is used for compact space machine tools.

Telescopic shield: The compression stroke is large, the speed is limited, and abnormal noise is easy to occur.

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