Abstract: A hammer having a coupling rod extended from a neck at one end of the hammer body of the hammer, a bell detachably attached to the coupling rod, a rubber socket mounted in a transverse through hole of the bell and a transverse through hole of the coupling rod to accommodate a stud nut, and a screw threaded into the stud nut to affix the socket and the bell to the coupling rod of the hammer body.

Abstract: A liquid crystal display module and a polarization optical device thereof. A thinfilm is disposed on a first prism, and includes a first refractive layer and a second refractive layer. The refractive index of the first refractive layer is different from that of the second refractive layer; therefore, a light from the first prism is divided into an S-ray and a P-ray. The S-ray is reflected back to the first prism by the thinfilm, thus preventing absorption by a polarizer. A second prism is disposed on the thinfilm. The P-ray is transmitted to the second prism from the thinfilm.