Features: Wear-resistant, recyclable. Easy to use in DIY operation. Balance plates in the same horizontal position. Improve the speed of tile installation. Reduce fatigue/pressure on installers. There is hardly any creaking, flat surface. Reduces the need for grinding and polishing. Prevent the plates from moving during solidification. Specifications:Material: High Quality PP + Stainless Steel Application Scope: Masonry Suitable Brick Slot: 2-6mm/0.08-0.24" Suitable Tile Thickness: 3-16mm/0.12-0.63" Level finder size: 73*36*36mm/2.87*1.42*1.42" Steel Needle Length: 32mm/1.26" :( Type A)20pcs Spacer Plates with Bubble/(B)30pcs Spacer Spacers, No Bubbles/(C)30pcs Stainless Steel NeedlesUse Tips:Lay the first plate, leaving more than 2mm (with cross seals). Close to attractions such as tiles. Insert the T-pins along the gap between the tiles. Then rotate 180 degrees and the T-needle will get stuck at the bottom of the two plates. Adjust the cover using a hand/special wrench until the two plates are at the same level. Once aligned, about 5-6 hours, before the cement/binder is completely dry, turn the lid back and remove the 180 degree T needle until the word is removed. Do not avoid removing the T-shaped tile leveling system:1. Ceramic plate gaskets are 2mm or more (transverse gaskets are recommended)2. During leveling, clean the cementitious or tile adhesives around the T.3 level. Remove the T-type straightener about 5-6 hours after leveling before completely drying the binder or cement. Note: This level detector does not contain steel needles. It is sold separately from steel needles. The level must be used with a steel needle. Since the customer replied that there was no room to use the needle, he sold it separately. Notes:1. Due to the different monitor and light effect, the actual color of the item may be slightly different from the color showed on the pictures. Thank you!2. Please allow 1-3mm measurement deviation due to manual measurement. A: 20 X Bubble Tile Spacers (without Steel Needle)B: 30 X Bubble Free Tile Spacers (without Steel Needles)C: 30 X Steel Needles