Changzhou Sanle tools co., Ltd. is a foreign enterprise specialized in producing hardware tools. The main products of this company are SL series hexagon ring spanner and for garden.

Hexagon wrench size is sometimes referred to "M" followed by the size of the tool or socket, that is, "M6", although this may be confused with the precise criteria for use;

Hexagon wrench size is sometimes referred to "M" followed by the size of the tool or socket that is "M6" even though this may be mistaken with the precise criteria for use;