8 Parts for hand-operated tools, namely, stop pieces, fork-like pieces, pressure pieces, pressure journals, centering and fixing pieces, operating pieces and arresting elements, namely, handles, levers, cranks, wheels, knobs, centering pins, bars, handlebars and clamps; parts for handoperated tools, in particular clamping irons, clamping lugs, clamping flaps and clamping supports, and positioning elements for grooves; positioning and clamping parts for handoperated tools, namely, stops, clamping hooks, eccentric clamping levers, eccentric clamping units, draw-down clamps, wedge type clamping segments, compensating clamps, mechanical and hydraulic clamping units, all the aforesaid goods also being in modular form; handoperated tools, namely, articulated lever and quick-fit clamps, adjustable and engageable hand clamping tools, ratchets, clamping joints, angular joints, articulation heads, height adjustment elements, positioning rings, and drilling devices being hand-operated drilling clamps