Vintage Kingmann-White Model 250 Mini-Sine Magnetic Sine Bar in Box. See photos to determine condition yourself. Vintage Kingmann-White Model 250 Mini-Sine – Magnetic Sine Bar in Original Box. Compact USA-made precision tool (Placentia, CA) for setting angles on mills/grinders/lathes. 2.5 center distance, V-base with magnets for flat/round work. Clean condition, sharp, strong hold – great for machinists/toolmakers. Box has patina but intact. Ready for use or collection!