This QBit saw blade kit includes both SQ1000-S single gang and SQ1000-D double gang blades for cutting rectangular wall box openings in drywall. The radially contoured blade creates a clean start and prevents the blade from walking during use, delivering exact cuts every time. Unlike drywall saws that leave ragged edges, this system makes perfect holes quickly and efficiently. The kit fits most 18V, 20V, or corded oscillating multi-tools (not compatible with 12V systems). Made from high-quality stainless steel and engineered in the USA. Single gang size: 2-3/8 x 3-3/4 inches. Double gang size: 3-3/4 x 4 inches.