Survey nail Size: 50mm, 75mm, 1000mm; Survey Nail 1 Available in three sizes 50mm, 75mm and 100mm the latter being type 1 permanent ground marker for dense very stable paved surfaces. 2 Large 20mm diameter head has a central monitoring recess which can be used to accurately receive a plumb-bob or prism pole. 3 The precise marks on the head allow easy alignment through an instrument's optical plumbing device. 4 Head has 'SURVEY-POINT' set as raised letters around the recess for instant identification. 5 Should additional washers be required then there are 30mm diameter (209355) & 50mm diameter (209360) available. Add to Basket
