The sciatic notch in females tend to be wider than the sciatic notches of males. Warded locks had special notches and grooves that made picking them more difficult. Using a delay line creates an unlimited series of equally spaced notches and peaks. The nibbling process cuts a contour by producing a series of overlapping slits or notches. This arises from such details as holes, grooves, notches and fillets. Like coping saws, the blade has pins that are held by notches in the frame. The truss is rested on the notches and bolted into place. The Second Model has rectangular cylinder notches. Each rotor contained one or more notches that controlled rotor stepping. The right and left clavicular notches articulate with the right and left clavicles, respectively. Bolt carriers were originally chrome plated and slick-sided, lacking forward assist notches. The steel framing and bracing is exposed at the four corner "notches" of the building. Two notches (or rings) designate where the bubble should be if the surface is level. Liz Fraser notches up the second of her four appearances here. Roman numerals evolved from this primitive system of cutting notches.