v shape aligned with the seam of the displaceable members 52 and threaded fastener 50 the housing 46 has a bore 54 extending its length and the wedge shaped member 48 include a threaded bore 56 for receiving the threaded fastener 50 in operation the threaded fastener 50 is inserted into the hosing bore 54 until engaging the threaded wedge bore 48 as the threaded fastener 50 is tightened the leading edge of the wedge 48 will force the displaceable housing members 52 apart fig7 is a perspective view of the cylinder clamp 20 of the present invention shown is a clamp component having a cylindrical body 58 with a threaded bore 60 extending centrally therethrough fig8 is a perspective view of the wedge block clamp 24 this variation has a block shaped housing 46 with a pair of displaceable members 52 at one end a wedge member 48 forming and inverted v shape aligned with the seam of the displaceable members 52 and threaded fastener 50 the displaceable members 52 project angularly upward from the seam to the peripheral edges to conform with the shape of the wedge 48 the housing 46 has a bore 54 extending its length and the wedge shaped member 48 include a threaded bore 56 for receiving the threaded fastener 50 in operation the threaded fastener 50 is inserted into the hosing bore 54.