... concrete slabs, decks, roofs, beams and prefabricated.Vertical spacer economic with a great stability, base has a minimal surface contact ... sample time:7~10days after receiving your paymentdelivery time:with 45days after receiving your downpaymentpayment:T/T, L/C ... a reputable, funny, enthusiastic and down-to-earth team with high ability."Customer oriented, meet customers' demands, exceed customers ...