1 Inch Dark Purple Octagon Crystal Cabinet Knob (Polished Chrome Base). Octagonal knob measures approximately 1 inch in diameter from widest point. Knob has a projection of 1 1/4 inch. The polished chrome base features a georgian roped border and measures 1 2/3 in diameter. These contemporary crystal knobs are wonderful. Subtle and beautiful, this color brings warmth and light into any room. These contemporary glass knobs are perfect for furniture drawers, bathroom vanities, dressers, furniture restoration, cabinet door handles and drawer pulls.