Several caps of the same shape and dimensions may be planed at one fixing, by placing them close, or nearly close together, and holding them with a plate and poppets, as denoted in Fig. 755. While thus held, the ends or lugs are planed, and also the short stems which are to fit a short distance into the gaps of the blocks. The holdfast plate is next taken from the middles, and plates are fixed upon the lugs, thus leaving the middles free to be planed for fitting to the brasses. Forged iron or steel caps are those consisting of plain flat bars without any stem; such are first planed on both their broad sides, either while held in a vice-chuck, or while gripped between poppets applied to the caps' edges, and are next bored, that the connecting-bolts may be attached, with the brasses between, to plane the caps' edges. Caps of this shape are used for flat-bottom brasses belonging to connecting-rods, and for a great number of plummer-block brasses which are rectangular instead of hexagonal or octagonal.