bids are invited for pierced sheet plank (psp) - pierced sheet plank (psp)size 10 feet x 15 inch(a) psp matting should be consist of steel strips with holes punched through it in rows and u-shaped channels formed between the holes. hooks should formed along one long edge and slots along the other long edge so that they could be connected to each other. the short edges are straight cut with no holes or hooks. to achieve lengthwise interlocking, the mats were laid in a staggered pattern.(b)the hooks should held in the slots by a steel clip that filled the part of the slot that is empty when the adjacent sheets are properly engaged together. the holes are bent down at their edges so that the beveled edge stiffened the area around the hole.(c) psp’sweight should about 66 pounds & having 10 feet long by 15 inches wide. the hole pattern for the sheet was 3 holes wide by 29 holes long resulting in 87 holes per mat. , concrete block - solid concrete block size (1x1x1.5 feet)(a) solid concrete blocks shall be sound and free from cracks, broken edges, and other defects and also having the ratio of 1:2:4 (cement : sand : aggregated).(b)dimensions and tolerancesthe concrete block units shall be made in sizes and shapes like corner, edge. solid concreate block shall be dimensions of length : 1.5 feetheight : 01 feet width : 01 feet. the tolerance in the length of the units shall not be more than +/- 5 mm and maximum variation in height and width of the unit, not more than +/- 3mm. total quantity : 1