This creation is a kind of cutter for mower construction of related what, which includes at least to have and seize unit on both sides by the arms, one seize the chain knife group that unit is seized on both sides by the arms on both sides by the arms by this； Unit is seized on both sides by the arms by this by the chain knife system of the cutter to seize on both sides by the arms, therefore when the cutter is by very big resistance, the big what of the resistance this seize unit on both sides by the arms seize power on both sides by the arms, the chain knife group i.e. can what this seize on both sides by the arms and voluntarily slided on unit, and can avoid chain knife group fracture, thereby promote use effect of grass trimmer. 本創作係有關於一種割草機刀具構造，該刀具至少包括有一挾持單元、一被該挾持單元所挾持的鏈刀組；藉由該刀具的鏈刀組係被該挾持單元所挾持，因此當該刀具受到極大阻力時，該阻力大於該挾持單元的挾持力，該鏈刀組即會於該挾持單元上自行滑動，而可避免該鏈刀組斷裂，藉此來提升割草機的使用功效。
