Abstract: A hole saw includes an arbor, a saw blade assembly having a saw blade and an adapter connected with the saw blade and provided with a protrusion received in an indentation of the arbor, a lid movably mounted on a body portion of the arbor and movable relative to the arbor between a first position where second coupling portions of the adapter are blocked by a block portion of the lid and coupled to first coupling portions of the arbor such that the saw blade assembly can't be rotatable relative to the arbor, and a second position where the second coupling portions of the adapter are staggered with the block portion and uncoupled from the first coupling portions of the arbor through the rotation of the saw blade assembly. Thus, the hole saw has the advantages of reducing vibration in use and convenience in assembly and disassembly works.

Abstract: A folding hand saw includes a first housing, a transmission unit disposed in the first housing, a second housing having a third pivotal end pivotally connected with a second pivotal end of the first housing and connected with the transmission unit, and a saw blade having a forth pivotal end pivotally connected with a first pivotal end of the first housing and connected with the transmission unit such that the saw blade is pivotable between a folded position where the saw blade is inserted into a first insertion groove of the first housing and a second insertion groove of the second housing, and an unfolded position where the saw blade leaves the first insertion groove and the second insertion groove. As a result, the folding hand saw of the present invention can prevent the saw blade from hurting a user or other people.

Abstract: A saw blade guard unit is used in cooperation with a handsaw having a saw blade and a handle connected with the saw blade. The saw blade guard unit includes a flexible strip and a holder. The flexible strip has a head end, a tail end for positioning to a front portion of the saw blade of the handsaw, and a body between the head end and the tail end for guarding teeth of the saw blade of the handsaw. The holder is adapted for mounting to the handle of the handsaw.

Abstract: A hole saw includes an arbor, a saw blade assembly having a saw blade and an adapter connected with the saw blade and provided with a protrusion received in an indentation of the arbor, a lid movably mounted on a body portion of the arbor and movable relative to the arbor between a first position where second coupling portions of the adapter are blocked by a block portion of the lid and coupled to first coupling portions of the arbor such that the saw blade assembly can't be rotatable relative to the arbor, and a second position where the second coupling portions of the adapter are staggered with the block portion and uncoupled from the first coupling portions of the arbor through the rotation of the saw blade assembly. Thus, the hole saw has the advantages of reducing vibration in use and convenience in assembly and disassembly works.