Milescraft 4 Clamp Squares (#4010)Clamp Squares can be used on both inside and outside corners. The 4 squares are ideal for small project construction, from building dollhouses to installing shelving. 4 x 4 90 Lightweight durable body that will not mar your workpieces. Perfect for those small projects where 90 clamping is needed. Prevents your clamps from shifting, providing precise alignment Allow you to use with FenceClamps, for variable clamp styles Patented featurethat is