... processing quality.SizeSize 600x600 595X5951200x2400 600x1200605X605 1220x2440Thickness6,7,7.5,8,9,9.5,10,12,12.5,13,15,15 ... or expansion bolt to fix the tracks on the ceilingand floor.3.Adjust and install the studs as per the request ... the same time avoid the over bending of the board. 6mm calcium silicate board