The combination router base is a retro fit, quick change, multi functional router base designed to increase the overall versatility of the router. Improve the quality of finish of every routing pass. Reduce the possibility of error. Increase stability during routing. Increase the level of precision achieved. Save set up time between tasks. Save space on storing hand made jigs. The crb has seven functions an offset baseplate, router compass from 19mm to 224mm radius, adjustable trenching with a clamp guide with 40mm micro adjustment, adjustable anti tilt support, adjustable mortising of timber from 50mm to 200mm width, adjustable false panel groove copier and also enhances the varijig frame system as an anti tilt device when used with routers that can accept euro style guide bushes a special guide bush ref gb40 b is required. The crb will fit most routers with two 8mm, 10mm and 12mm fence rod holes at centres of 78mm to 130mm. An accessory quick fit edge trimming base is available for trimming lipping up to 16mm wide and 6mm projection, ref. Crb tb. Larger circles can be accommodated by using ccessory extension rods ref. N compass aex to increase radius by 560mm. Design reg. No. 3003693. Contents 1 x plastic baseplate with handle 1 x bridge 2 x rods 8mm dia x 270mm 1 x bridge shim pack 2x2mm, 1x2mm, 1x1mm, 1x0.5mm 1 x pivot pin 1 x pair of mortise pillars