Your search for "rectangular frame" revealed the following:

Rectangular Frame, SF380 (Eight-cut size, 242mm X 303mm), White

QuiltParty Original Frame ( 18cm inner diameter, not include a glass ) (with Japanese instruction)

QuiltParty Original Frame ( 30cm inner diameter, not include a glass )

QuiltParty Original Natural Wood Frame with Worm-eaten Holes ( MA-15, 15cm inner diameter, not include a glass ) (with Japanese instruction)

QuiltParty Original Blue Gray Wood Frame with Worm-eaten Holes ( 18cm inner diameter, not include a glass ) (with Japanese instruction)

Clover, Embroidery Hoop Stand, 57-510

COSMO, Embroidery Kit with Printed Design, "12 Month Plant Notebook (with Frame) by Kazuko Aoki"

COSMO, Embroidery Kit with Printed Design, "Garden Sketchbook (with Frame) by Kazuko Aoki"

Rectangle Buckle with Slider Bar, 2.5cm (1pc)

Rectangle Buckle with Slider Bar, 2cm (1pc)

Rectangle Buckle with Slider Bar, 4cm (1pc)

Rectangle Adjustment Buckle Set

Rectangle Buckle with Slider Bar, 3cm (1pc)

Yoko Saito Original Embroidery Pattern Kit ( Japanese instruction only )

Clover, Craft Loupe, (1.6X & 2.0X Power), Magnifying Glasses Type

Kit of Scandinavian-style Flower Pattern (no instruction), No. 10

Chocolate Bar Pochette (NO instruction) in "Quilt Japan October 2026 Autumn Issue

Hexagon Log Cabin Quilt (with Japanese instruction only)

Kit of Scandinavian-style Flower Pattern (no instruction), No.1