Profile: DJ Edman & Company specializes in providing WheelLugGauge™. It measures the bolt pattern (bolt circle), of wheels and hubs with four or five lug bolts. It accurately measures the centerline distance between neighboring lug bolt holes of a wheel or the lug bolts of a hub. It determines the mounting pattern of all popular cars and light trucks, foreign and domestic.The ergonomic design permits easy one hand use with exceptional control by putting the fingers in the recess of the back and the thumb on the adjustable leg.