plastic material, bearing strip,upper part name assigned by controlling agency, 4.270 inches nominal overall length, material 0.062 plastic sheet type ii class 1 per l-p-392; 2 holes 0.140 to 0.145 diameter, countersunk 100 deg x 0.280 to 0.290 diameter special features, 0.470 inches minimum and 0.500 inches maximum overall width